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    Supramolecular Isomerism in a Cadmium Bis(<i>N</i>‑Hydroxyethyl, <i>N</i>‑isopropyldithiocarbamate) Compound: Physiochemical Characterization of Ball (<i>n</i> = 2) and Chain (<i>n</i> = ∞) Forms of {Cd[S<sub>2</sub>CN(iPr)CH<sub>2</sub>CH<sub>2</sub>OH]<sub>2</sub>·solvent}<sub><i>n</i></sub>

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    Needles of [{Cd­[S<sub>2</sub>CN­(iPr)­CH<sub>2</sub>CH<sub>2</sub>OH]<sub>2</sub>}<sub>3</sub>·MeCN]<sub>∞</sub> (<b>2</b>) were harvested from a dry acetonitrile solution of Cd­[S<sub>2</sub>CN­(iPr)­CH<sub>2</sub>CH<sub>2</sub>OH]<sub>2</sub> after one or two days and proved to be a coordination polymer in which all dithiocarbamate ligands are ÎŒ<sub>2</sub>,Îș<sup>2</sup>-tridentate, bridging two cadmium atoms and simultaneously chelating one of these. If the same solution was allowed to stand for at least several days, <b>2</b> is replaced by blocks comprising a supramolecular isomer of <b>2</b>, dimeric <b>1</b>, with formula {Cd­[S<sub>2</sub>CN­(iPr)­CH<sub>2</sub>CH<sub>2</sub>OH]<sub>2</sub>}<sub>2</sub>·2H<sub>2</sub>O·2MeCN, and two ligands coordinating ÎŒ<sub>2</sub>,Îș<sup>2</sup> as in <b>2</b> and the other two purely Îș<sup>2</sup>-chelating. The time dependency correlates with the pivotal role of water in driving the conversion of “chain” <b>2</b> to “ball” <b>1</b>; crystals of <b>2</b> could not be isolated from “wet” acetonitrile. When each of <b>1</b> and <b>2</b> are dissolved in solution, they exhibit comparable spectroscopic attributes (<sup>1</sup>H, <sup>13</sup>C, and <sup>113</sup>Cd NMR and UV/vis), indicating the solution structures are the same. Both <b>1</b> and <b>2</b> are luminescent in the solid state with <b>1</b> being significantly brighter than <b>2</b>. Greenockite CdS nanoparticles are generated by the thermal decomposition of both <b>1</b> and <b>2</b>
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